1Arm Development Platform Build Options 2====================================== 3 4Arm Platform Build Options 5-------------------------- 6 7- ``ARM_BL31_IN_DRAM``: Boolean option to select loading of BL31 in TZC secured 8 DRAM. By default, BL31 is in the secure SRAM. Set this flag to 1 to load 9 BL31 in TZC secured DRAM. If TSP is present, then setting this option also 10 sets the TSP location to DRAM and ignores the ``ARM_TSP_RAM_LOCATION`` build 11 flag. 12 13- ``ARM_CONFIG_CNTACR``: boolean option to unlock access to the ``CNTBase<N>`` 14 frame registers by setting the ``CNTCTLBase.CNTACR<N>`` register bits. The 15 frame number ``<N>`` is defined by ``PLAT_ARM_NSTIMER_FRAME_ID``, which 16 should match the frame used by the Non-Secure image (normally the Linux 17 kernel). Default is true (access to the frame is allowed). 18 19- ``ARM_DISABLE_TRUSTED_WDOG``: boolean option to disable the Trusted Watchdog. 20 By default, Arm platforms use a watchdog to trigger a system reset in case 21 an error is encountered during the boot process (for example, when an image 22 could not be loaded or authenticated). The watchdog is enabled in the early 23 platform setup hook at BL1 and disabled in the BL1 prepare exit hook. The 24 Trusted Watchdog may be disabled at build time for testing or development 25 purposes. 26 27- ``ARM_LINUX_KERNEL_AS_BL33``: The Linux kernel expects registers x0-x3 to 28 have specific values at boot. This boolean option allows the Trusted Firmware 29 to have a Linux kernel image as BL33 by preparing the registers to these 30 values before jumping to BL33. This option defaults to 0 (disabled). For 31 AArch64 ``RESET_TO_BL31`` and for AArch32 ``RESET_TO_SP_MIN`` must be 1 when 32 using it. If this option is set to 1, ``ARM_PRELOADED_DTB_BASE`` must be set 33 to the location of a device tree blob (DTB) already loaded in memory. The 34 Linux Image address must be specified using the ``PRELOADED_BL33_BASE`` 35 option. 36 37- ``ARM_PLAT_MT``: This flag determines whether the Arm platform layer has to 38 cater for the multi-threading ``MT`` bit when accessing MPIDR. When this flag 39 is set, the functions which deal with MPIDR assume that the ``MT`` bit in 40 MPIDR is set and access the bit-fields in MPIDR accordingly. Default value of 41 this flag is 0. Note that this option is not used on FVP platforms. 42 43- ``ARM_RECOM_STATE_ID_ENC``: The PSCI1.0 specification recommends an encoding 44 for the construction of composite state-ID in the power-state parameter. 45 The existing PSCI clients currently do not support this encoding of 46 State-ID yet. Hence this flag is used to configure whether to use the 47 recommended State-ID encoding or not. The default value of this flag is 0, 48 in which case the platform is configured to expect NULL in the State-ID 49 field of power-state parameter. 50 51- ``ARM_ROTPK_LOCATION``: used when ``TRUSTED_BOARD_BOOT=1``. It specifies the 52 location of the ROTPK returned by the function ``plat_get_rotpk_info()`` 53 for Arm platforms. Depending on the selected option, the proper private key 54 must be specified using the ``ROT_KEY`` option when building the Trusted 55 Firmware. This private key will be used by the certificate generation tool 56 to sign the BL2 and Trusted Key certificates. Available options for 57 ``ARM_ROTPK_LOCATION`` are: 58 59 - ``regs`` : return the ROTPK hash stored in the Trusted root-key storage 60 registers. 61 - ``devel_rsa`` : return a development public key hash embedded in the BL1 62 and BL2 binaries. This hash has been obtained from the RSA public key 63 ``arm_rotpk_rsa.der``, located in ``plat/arm/board/common/rotpk``. To use 64 this option, ``arm_rotprivk_rsa.pem`` must be specified as ``ROT_KEY`` 65 when creating the certificates. 66 - ``devel_ecdsa`` : return a development public key hash embedded in the BL1 67 and BL2 binaries. This hash has been obtained from the ECDSA public key 68 ``arm_rotpk_ecdsa.der``, located in ``plat/arm/board/common/rotpk``. To 69 use this option, ``arm_rotprivk_ecdsa.pem`` must be specified as 70 ``ROT_KEY`` when creating the certificates. 71 - ``devel_full_dev_rsa_key`` : returns a development public key embedded in 72 the BL1 and BL2 binaries. This key has been obtained from the RSA public 73 key ``arm_rotpk_rsa.der``, located in ``plat/arm/board/common/rotpk``. 74 75- ``ARM_ROTPK_HASH``: used when ``ARM_ROTPK_LOCATION=devel_*``, excluding 76 ``devel_full_dev_rsa_key``. Specifies the location of the ROTPK hash. Not 77 expected to be a build option. This defaults to 78 ``plat/arm/board/common/rotpk/*_sha256.bin`` depending on the specified 79 algorithm. Providing ``ROT_KEY`` enforces generation of the hash from the 80 ``ROT_KEY`` and overwrites the default hash file. 81 82- ``ARM_TSP_RAM_LOCATION``: location of the TSP binary. Options: 83 84 - ``tsram`` : Trusted SRAM (default option when TBB is not enabled) 85 - ``tdram`` : Trusted DRAM (if available) 86 - ``dram`` : Secure region in DRAM (default option when TBB is enabled, 87 configured by the TrustZone controller) 88 89- ``ARM_XLAT_TABLES_LIB_V1``: boolean option to compile TF-A with version 1 90 of the translation tables library instead of version 2. It is set to 0 by 91 default, which selects version 2. 92 93- ``ARM_CRYPTOCELL_INTEG`` : bool option to enable TF-A to invoke Arm® 94 TrustZone® CryptoCell functionality for Trusted Board Boot on capable Arm 95 platforms. If this option is specified, then the path to the CryptoCell 96 SBROM library must be specified via ``CCSBROM_LIB_PATH`` flag. 97 98- ``ARM_ETHOSN_NPU_DRIVER``: boolean option to enable a SiP service that can 99 configure an Arm® Ethos™-N NPU. To use this service the target platform's 100 ``HW_CONFIG`` must include the device tree nodes for the NPU. Currently, only 101 the Arm Juno platform has this included in its ``HW_CONFIG`` and the platform 102 only loads the ``HW_CONFIG`` in AArch64 builds. Default is 0. 103 104- ``ARM_SPMC_MANIFEST_DTS`` : path to an alternate manifest file used as the 105 SPMC Core manifest. Valid when ``SPD=spmd`` is selected. 106 107- ``ARM_BL2_SP_LIST_DTS``: Path to DTS file snippet to override the hardcoded 108 SP nodes in tb_fw_config. 109 110- ``OPTEE_SP_FW_CONFIG``: DTC build flag to include OP-TEE as SP in tb_fw_config 111 device tree. This flag is defined only when ``ARM_SPMC_MANIFEST_DTS`` manifest 112 file name contains pattern optee_sp. 113 114- ``TS_SP_FW_CONFIG``: DTC build flag to include Trusted Services (Crypto and 115 internal-trusted-storage) as SP in tb_fw_config device tree. 116 117- ``ARM_GPT_SUPPORT``: Enable GPT parser to get the entry address and length of 118 the various partitions present in the GPT image. This support is available 119 only for the BL2 component, and it is disabled by default. 120 The following diagram shows the view of the FIP partition inside the GPT 121 image: 122 123 |FIP in a GPT image| 124 125For a better understanding of these options, the Arm development platform memory 126map is explained in the :ref:`Firmware Design`. 127 128.. _build_options_arm_css_platform: 129 130Arm CSS Platform-Specific Build Options 131--------------------------------------- 132 133- ``CSS_DETECT_PRE_1_7_0_SCP``: Boolean flag to detect SCP version 134 incompatibility. Version 1.7.0 of the SCP firmware made a non-backwards 135 compatible change to the MTL protocol, used for AP/SCP communication. 136 TF-A no longer supports earlier SCP versions. If this option is set to 1 137 then TF-A will detect if an earlier version is in use. Default is 1. 138 139- ``CSS_LOAD_SCP_IMAGES``: Boolean flag, which when set, adds SCP_BL2 and 140 SCP_BL2U to the FIP and FWU_FIP respectively, and enables them to be loaded 141 during boot. Default is 1. 142 143- ``CSS_USE_SCMI_SDS_DRIVER``: Boolean flag which selects SCMI/SDS drivers 144 instead of SCPI/BOM driver for communicating with the SCP during power 145 management operations and for SCP RAM Firmware transfer. If this option 146 is set to 1, then SCMI/SDS drivers will be used. Default is 0. 147 148 - ``CSS_SGI_CHIP_COUNT``: Configures the number of chips on a SGI/RD platform 149 which supports multi-chip operation. If ``CSS_SGI_CHIP_COUNT`` is set to any 150 valid value greater than 1, the platform code performs required configuration 151 to support multi-chip operation. 152 153- ``CSS_SGI_PLATFORM_VARIANT``: Selects the variant of a SGI/RD platform. A 154 particular SGI/RD platform may have multiple variants which may differ in 155 core count, cluster count or other peripherals. This build option is used 156 to select the appropriate platform variant for the build. The range of 157 valid values is platform specific. 158 159- ``CSS_SYSTEM_GRACEFUL_RESET``: Build option to enable graceful powerdown of 160 CPU core on reset. This build option can be used on CSS platforms that 161 require all the CPUs to execute the CPU specific power down sequence to 162 complete a warm reboot sequence in which only the CPUs are power cycled. 163 164-------------- 165 166.. |FIP in a GPT image| image:: ../../resources/diagrams/FIP_in_a_GPT_image.png 167 168*Copyright (c) 2019-2021, Arm Limited. All rights reserved.* 169
